[PATCH RESEND V2 0/1] Drivers: hv

[K. Y. Srinivasan]

Add a basic balloon driver to take advantage of the dynamic memory
management functionality supported on Windows hosts. Windows requires
the guests to support both memory hot add as well as ballooning. In this patch
we are adding the basic balloon driver. Memory hot add will be added in a
subsequent patch and this requires some changes yet to be made on the host
side.

The policy engine on Windows hosts needs the guest to post memory status
periodically and it looks like committed_as is what it is expecting.
Since vm_committed_as is not currently an exported symbol, this patch set
also exports this symbol.

In V1 of this patch set, I had addressed comments from Greg KH, Rusty Russell
and Andrew Morton:

1) Cleaned up the copyright notice in hv_balloon.c
2) Fixed a typo in Kconfig help string
3) Exported the needed symbol as a GPL symbol
4) Changed the hot_add module parameter to be a boolean variable
5) Got rid of the code that manipulated totalram_pages
6) Cleaned up the allocation flags.

In this version, thanks to David Rientjes <rientjes@xxxxxxxxxx>, I have
defined an API for accessing the guest  committed memory and this API
has been used in the Hyper-V balloon driver. The patch that exports the
API for accessing guest committed memory has been accepted by Andrew Morton. 

K. Y. Srinivasan (1):
  Drivers: hv: Add Hyper-V balloon driver

 drivers/hv/Kconfig      |    6 +
 drivers/hv/Makefile     |    1 +
 drivers/hv/hv_balloon.c | 1041 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 1048 insertions(+), 0 deletions(-)
 create mode 100644 drivers/hv/hv_balloon.c

-- 
1.7.4.1

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